Chess Engines Diary

Pigeon  - UCI chess engine,  Author: Stuart Riffle    homepage   About version 1.51 : Fixed timing logic under 40/4 and 40/25 time controls (thanks to Graham Banks for pointing out the error!) Fixed delay when setting a new position at the start of a move. Pigeon 1.51 fix I discovered a huge bug for it on my non popcount hardware recently manifesting in weird evals directly after start positions. Even weirder it seems only to happen if the start position is below 12 plies (I used 6 plies). This happened in around 1/3 of all games in 40/2 test games and resulted sometimes in plain piece blunders, at around move 7 the weird evals disappeared but the damage was done. Finally Martin Sedlak (Cheng) looked into it and found something with UB sanitizer. It seems SquareBit indexing was screwed up. Martin sent me a quick fix (also with a hack for easier compiling in Windows) and really my tests showed the error was gone. Pigeon 1.51 fix download  

Pigeon  - UCI chess engine   Author: Stuart Riffle   homepage   Rating JCER=1388 About version 1.51 : Fixed timing logic under 40/4 and 40/25 time controls (thanks to Graham Banks for pointing out the error!) Fixed delay when setting a new position at the start of a move. All files (games, tables and engines) - download from page Pigeon 1.51 download  

Pigeon  - UCI chess engine   Author: Stuart Riffle   homepage   Rating JCER=1404 Pigeon 1.50 download   All files (games, tables and engines) - download from page

Pigeon  - UCI chess engine   Author: Stuart Riffle   homepage   Pigeon 1.40 download   All files (games, tables and engines) - download from page

Pigeon  - UCI chess engine   Author: Stuart Riffle   homepage   Pigeon 1.37 download   All files (games, tables and engines) - download from page

Pigeon - UCI chess engine Author: Stuart Riffle homepage Pigeon 1.36 download All files (games, tables and engines) - download from page

Games download Temp Hardware System 100 games 3' + 3" Intel Core i7-4710MQ CPU @ 2.50GHz z 7,9 GB Windows 10 64 bit DOWNLOAD Book GUI JCER Games Table created Perfect 2015 Arena 3.5.1 106.606 games download Scid vs PC All files (games, tables and engines) - download from page

Pigeon - UCI chess engine Author: Stuart Riffle homepage Pigeon 1.33 download All files (games, tables and engines) - download from page